JP2012081175A - Fireproof section treating structure of cable duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem wherein a structure known as a fireproof structure of a penetrating part of cable wiring is executed by filling a fire resistant filler such as rock wool around a cable that penetrates the inside of an opening of a floor, arranging fire resistant partition plates made of calcium silicate plates on the upper and lower sides of a fireproof partition body, then fixing the upper and lower fire resistant partition plates to the fireproof partition body using anchor bolts and filling fire resistant putty in a clearance between the cable and the fire resistant partition plates to carry out sealing, but construction by this method requires time and labor to remove the existing fire resistant partition plates for the extension and change of the cable when extending and changing the cable.SOLUTION: A support hardware is provided at the end of a skeleton cross section outside flange duct having the same inside dimensions as opening hole inner wall dimensions. A fire resistant plate subjected to cable penetration notch treatment is laid on the support hardware, and fire resistant blocks are filled in a clearance between the opening inner wall and a cable.

Description

  TECHNICAL FIELD The present invention relates to electrical work and on-site construction of power cables, and relates to a fire prevention structure of a cable wiring penetrating portion that penetrates a floor or a wall in a fire prevention section of a building.

In recent years, power cables and the like have been used in large quantities due to the increase in size and height of buildings. As a result, the risk of fires related to power cables has increased. A cable fire spreads along the cable track. When cables pass through walls and floors of fire prevention compartments, fire prevention measures are also required at the penetrations. If fire prevention measures are not taken at the cable penetration, there is a risk that a fire that occurred in a part of the building will spread through the cable and spread all over. It is stipulated that a fire prevention zone is provided to prevent the transmission of the fire.

Conventionally, in the fire prevention structure of the penetration part of the cable wiring, a fireproof filler such as rock wool is packed around the long body (cable) that penetrates the opening of the floor (fire prevention compartment), and A fireproof partition plate made of calcium silicate plate (calcal plate) is placed on the plate. Thereafter, a structure is known in which the upper and lower pressure plate fireproof partition plates are fixed to the fireproof partition with anchor bolts, and the gap between the cable and the fireproof partition plate is filled with a fireproof putty for sealing.

Japanese Patent Laid-Open No. 3-24183

In the above-mentioned conventional processing structure, when there is a need to add or change cables due to the expansion of peripheral equipment, etc., unscrew the cable duct, and install fire protection parts such as rock wool and fireproof dividers. After removing it, it was expanded and changed. Moreover, it usually takes several days for the replacement work. Also, depending on the scale of the construction, it may take several weeks, so the through hole is open during the construction period. Therefore, when a fire occurs in that state, there is a possibility that smoke blows out from the through-hole and spreads. Furthermore, the calcium silicate plate as a fireproof plate is fragile in strength and has a problem that it is difficult to control tightening.

  In order to solve the above problems, the present invention provides a cable floor penetration part in which a cable disposed in a cable duct vertically penetrates a section. Equipped with a U-shaped support hardware at the end of the flange duct, and a fire-resistant plate that has been cut through the cable is laid on the U-shaped support hardware, and fire-resistant compartment treatment material in the gap between the inner wall of the opening and the cable As a rock wool filler, a graphite heat-expandable fireproof block was applied, and the fireproof block was expanded by heat in the event of a fire to prevent a gap between the opening and the cable.

  According to the present invention, since the calcium silicate plate is not used as the fireproof partition plate, the fear that the strength is strongly broken is reduced. Furthermore, there is no need for an electric tool for processing the calcium silicate plate, and there is no dust or noise. In addition, the fireproof block and fireproof plate can be removed from the duct inspection door, which facilitates cable inspection and expansion work. Since rock wool is not used, there is no need to worry about dust scattering, and construction from the floor side is possible, and work at high places is not required, increasing safety.

FIG. 1 is a structural diagram of the present invention. FIG. 2 is a processing diagram of the through section of the fire protection compartment of the present invention FIG. 3 is a sectional view of the cable duct according to the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  One embodiment of the present invention is shown in FIG. Three U-shaped support fittings (2) are attached to the ends of the cable duct (1) of the outer flange structure (1a) having the same inner dimension as the inner wall dimension of the opening hole. In the present embodiment, three U-shaped support hardwares (2) are used, but the number is not limited to three and may be determined as needed in consideration of the size of the cable duct (1). A fireproof plate (3) that has been cut out so that the cable can penetrate is laid on the U-shaped support hardware (2). A cable (5) is passed through the notched refractory plate, and a refractory block (4) of a graphite-based thermal expansion material is packed in the gap between the inner wall of the opening and the cable without any gap (FIG. 3). The fireproof block has an effect of closing a gap between the opening and the cable due to thermal expansion when a fire occurs.

1 Cable duct 1a Flange 1b Inspection door 2 U-shaped bracket 3 Fireproof plate 3a Notch treatment 4 Fireproof block 5 Cable

Claims (1)

  The cable installed in the cable duct is provided with a support metal fitting at the end of the outer flange duct that has the same inner dimension as the inner wall dimension of the opening hole in the fire prevention structure of the cable penetration part that penetrates the section. Fire-resistant compartment processing structure characterized by laying a fire-resistant plate with a notch treatment on a support hardware and filling a space between the inner wall of the opening and the cable with a fire-resistant block

Images